Selective and rapid capture of Sr2+ with LTA zeolites: Effect of crystal sizes and mesoporosity

Kwon, Seungdon; Choi, Yuyeol; Singh, B. B.; Na, Kyungsu

doi:10.1016/j.apsusc.2019.145029

Cited by 18 publications

(9 citation statements)

References 32 publications

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“…The LTL zeolite with Si/Al ratio of 2.97 contained a higher exchangeable site that increased the ion exchange rate. Besides, the crystal size of MOR zeolite is larger than that of LTL crystal, which might decrease the diffusion rate of ion in MOR zeolite as observed in other reported works (Kwon et al 2020).…”

Section: Kinetic Studiesmentioning

confidence: 70%

“…Therefore, the adsorption capacity of natural zeolites is highly different from reported works, varied from a few to hundreds of mg/g, depending on the sources of the zeolites (Sprynskyy et al 2006, Erdem et al 2004, Wang et al 2008. Synthetic zeolites have been used in catalytic reaction, gas separation, sensing material, wastewater treatment (Kwon et al 2020). Among various zeolite frameworks, Linda Type A (LTA) zeolite has the lowest silicon-aluminum ratio, Si/Al of 1-2, leading to the highest cation exchange capacity (Collins et al 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Synthetic LTA zeolite was used as adsorbent material for the removal of heavy metal and radioactive metal ions from aqueous solution (El-Kamash et al 2005, Ibrahim et al 2010, Tashauoei et al 2010, Lu et al 2016, Shen et al 2017, Hong et al 2019, Li et al 2020. Despite its remarkable cation exchange capacity, the small-pore of LTA zeolite, with the pore diameter of 4.1 Å, may affect their metal ions removal efficiency (Kwon et al 2020).…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Large Pore LTL and MOR Zeolites and Use as Adsorbent for The Removal of Heavy Metal and Radioactive Metal Ions in Aqueous Solution

Nguyen

Pham

et al. 2021

Preprint

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Heavy metal and radioactive ions can cause serious environmental problems if they are not completely removed from wastewater as well as in groundwater. In this study, large pore LTL and MOR zeolites were successfully synthesized and used as adsorbent to remove Pb2+, Cu2+, Zn2+, Cd2+, Cs+ and Sr2+ ions in aqueous solution. At low initial concentration (10 ppm), LTL and MOR zeolites effectively removed above metal ions with removal efficiency in the range of 95–99%. Both zeolites showed high affinity to Cs+ and Pb2+ ions with the adsorption capacity of LTL zeolite to Cs+ and Pb2+ were 278.8 mg/g and 141.4 mg/g, and that of MOR zeolite were 238.8 mg/g and 178.9 mg/g, respectively. The EDS results showed that Pb2+ ions from the aqueous solution were exchanged with exchangeable Na+ ions in MOR zeolite and K+ ions in LTL zeolite. The pseudo-second-order kinetic model and Langmuir isotherm model fitted better to experiment data on the adsorption of metal ions on both LTL and MOR zeolite. This result revealed that the adsorption of these metal ions on LTL and MOR zeolite was monolayer chemisorption. The equilibrium adsorption results showed that the microstructure of zeolite significantly affected the adsorption capacity of LTL and MOR zeolite on removal of tested metal ions.

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Section: Kinetic Studiesmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of Large Pore LTL and MOR Zeolites and Use as Adsorbent for The Removal of Heavy Metal and Radioactive Metal Ions in Aqueous Solution

Nguyen

Pham

et al. 2021

Preprint

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“…Another effective way to produce small and uniform zeolite crystals is by prolonging the aging time, as it promotes the formation of more nuclei. 9,31 In the synthesis of NaK-LSX zeolites, it was found that the increase of aging time from 24 to 72 h diminishes the crystal size from 3.7 to 1.9 mm. 31 This phenomenon is also observed in the synthesis of zeolite A from the TMAOH-containing synthesis gel with a Si/Al ratio of 3.06.…”

Section: Reduction Of Crystal Sizesmentioning

confidence: 99%

“…5,6 The crystal size can be finely tuned by altering the seed amounts 10 and/or controlling the crystallization time 7 and gel composition. 8,9 Another effective method to facilitate the reactant, intermediate and product diffusions is the introduction of hierarchical pores by creation of macro/mesopores or assembly of zeolite nanocrystallites using soft or hard templates. 11,12 This expands the application of zeolites in the reactions involving large molecules, such as sugar conversion and heavy oil cracking reactions.…”

Section: Introductionmentioning

confidence: 99%

Improvement of adsorption and catalytic properties of zeolites by precisely controlling their particle morphology

Yang

Wang

et al. 2022

Chem. Commun.

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Methods to prepare biosorbents and magnetic sorbents for water treatment: a review

et al. 2023

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Access to drinkable water is becoming more and more challenging due to worldwide pollution and the cost of water treatments. Water and wastewater treatment by adsorption on solid materials is usually cheap and effective in removing contaminants, yet classical adsorbents are not sustainable because they are derived from fossil fuels, and they can induce secondary pollution. Therefore, biological sorbents made of modern biomass are increasingly studied as promising alternatives. Indeed, such biosorbents utilize biological waste that would otherwise pollute water systems, and they promote the circular economy. Here we review biosorbents, magnetic sorbents, and other cost-effective sorbents with emphasis on preparation methods, adsorbents types, adsorption mechanisms, and regeneration of spent adsorbents. Biosorbents are prepared from a wide range of materials, including wood, bacteria, algae, herbaceous materials, agricultural waste, and animal waste. Commonly removed contaminants comprise dyes, heavy metals, radionuclides, pharmaceuticals, and personal care products. Preparation methods include coprecipitation, thermal decomposition, microwave irradiation, chemical reduction, micro-emulsion, and arc discharge. Adsorbents can be classified into activated carbon, biochar, lignocellulosic waste, clays, zeolites, peat, and humic soils. We detail adsorption isotherms and kinetics. Regeneration methods comprise thermal and chemical regeneration and supercritical fluid desorption. We also discuss exhausted adsorbent management and disposal. We found that agro-waste biosorbents can remove up to 68–100% of dyes, while wooden, herbaceous, bacterial, and marine-based biosorbents can remove up to 55–99% of heavy metals. Animal waste-based biosorbents can remove 1–99% of heavy metals. The average removal efficiency of modified biosorbents is around 90–95%, but some treatments, such as cross-linked beads, may negatively affect their efficiency.

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Selective and rapid capture of Sr2+ with LTA zeolites: Effect of crystal sizes and mesoporosity

Cited by 18 publications

References 32 publications

Synthesis of Large Pore LTL and MOR Zeolites and Use as Adsorbent for The Removal of Heavy Metal and Radioactive Metal Ions in Aqueous Solution

Synthesis of Large Pore LTL and MOR Zeolites and Use as Adsorbent for The Removal of Heavy Metal and Radioactive Metal Ions in Aqueous Solution

Improvement of adsorption and catalytic properties of zeolites by precisely controlling their particle morphology

Methods to prepare biosorbents and magnetic sorbents for water treatment: a review

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